Process of producing dyestuffs on the fiber by means of the one-bath method.



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vFELIX KUNERT AND EDWIN ACKER, OF OFFENBACH-ON-THE-MAIN, GERMANYASSIGNORS TO CORPORATION OF CHEMISCHE FABRIK GRI-ESHEIM-ELEKTBON,

OF-FRANKFORT-ON-THE-MAIN, GERMANY.

PROCESS OF PRODUCING DYESTUFFS ON THE FIBER BY MEANS OF THE ONE-BATHPatentedFeb. 2, 1915.-

METHOD.

,1 7,021 Specification of Letters Patent.

'No Drawing.

To all whom it may concern I Be it known that We, FELIX KUNERT and EDWINACKER, citizens oft-he German Emand residents of Ofi'enbach-on-the-Main, in the Grand Duchy of Hesse, Germany, have invented new and usefulImprovements in Processes of Producing Dyestuffs on the Fiber by Meansof the One- Bath Method, of which the following is a specification.

Our invention relates to an improvement in the art of producingdyestufls on the fiber by means of the one-bath method, consisting indeveloping the dyestuffs by passing into acid agents the cotton goods,which have been impregnated with the solution of an ayrlamid of2.3-oxynaphthoic acid of the general formula: Y

1 i... wherein R means an aromatic radical, and of a nitrosamin salt ofthe general formula:

/NO alkali metal, wherein R means also an aromatic radical, obtainableby causing an alkali to act upon a diazo solution. Under the term acidagents We include feeble acids or acid salts. As compared with theprocess, described in the German Letters Patents No. 81791 and 83010according to which beta-naphthol and a nitrosamin salt are used, by thepres: ent process, according to whichthe aryl amids of 2.3-oxynaphthoicacid are used excellent results and brilliant red shades are obtainedand'the new pastes containing an arylamid of 2.3-oxynaphthoic acid and adistinguished from those containing beta-naphthol, by their essentiallygreater stability. ,1; Therefore the presscut process represents I animportant improvement, since thereby'we were successful in solving aproblem which others have tried to solve many times without success,viz: to print ice-colors directly without'the antecedent preparation ofthe fiber and to Example III: 24: g. naphthoic acid, 4:0 com. of causticof 34 B., g. ofsodium ricinoleate of 60.

Application filed April 17, 1914. Serial No. 832,532.v

produce very fast and brilliant shades by a cheap and simple method.

0 ,The present process is materially distmguished from those, describedin the United States Letters Patent No. 913634 and the German LettersPatent No. 238841 according to which the 2.1-naphtholsulfonic acid andthe 2.1-naphthol carhoxylic acid respectively are used as startingcompounds, slnce in the present case the carboxylic acid is not splitoff and therefore no beta-naph-' thol dyestuffs are formed.

In order to illustrate the new process more fully the following examplesare,

given, parts being by weight.

Example I: 24; g. of anilid of 2.3-oxy- 'naphthoic acid, 40 com. ofcaustic soda lye of 85 B. and 50 g. of sodium ricinoleate of 60 percent. strength are dissolved in 150 g. of hot Water, cooled down andpoured into a solution of 18 g. of nitrosamin-alkali metal salt ofpara-nitranilin of the formula:

g. of-water is added and the whole is made .-up t o 1liter. The yarn isimpregnated with thisw solution, wrung out and passed in a -wetcondition without being dried in a hot bath of 10 g. of sodiumbichromate per liter. Afterwashing and soaping a beautiful red isobtained. I

anilid of 2.3-oxypercent. strength are-dissolved at 260 g. of hot water,cooled down and poured into a soda lye solution of 19 g. ofnitrosamin-alkali metal salt of meta-nitro-para-toluidin of the formula:

,uo cm alka1l metal v i \NO:- I and 500 g. of tragacanth thickening 1:15are added. Cotton goods are printed with this solution, dried and passedat 80 C. in a solution of acetic acid (8 B.), containing 50 g. perliter. In this way a very pure brilliant red of an excellent fastness isobtained, which is very similar to the alizarin red.

Example IV: 12g. of anilid of 2.3-oxynaphthoic acid, 20 g. of-causticsoda lye of 34 B., g. of sodium ricinoleate of 60 per cent. strength aredissolved in 330 g. of

hot water, cooled down and poured into a solution of 11 g. ofnitrosamin-alkali metal salt of ,para-nitro-ortho-anisidin of theformula: i No,

and 550 g. of tragacanth thickening 1:15-

- are added. Cotton goods are printed with this solution, dried andpassed at 80 in a solution of, acetic acid (8 B), containing g. perliter. In this way a very beautiful With other nitrosamin salts andother arylamids of 2.3-oxynaphthoic acid the process can be executed inthe same manner.

wherein R means an aromaticradical and of a nitrosamin salt oi thegeneral formula:

N613 R1-N alkali metal, wherein R means also an aromatic radical.

That we claim theforegoing as our 1nvent1on, we have signed our nameslnpresence of two witnesses, this -30th day of March 1914. FELIX KUNERT.

EDWIN ACKER. As to Felix Kune'rt:

JEAN Gmmn, CARL GRUND. As to Edwin Acker:

CLAREN on CARRIGAN, MARIUS'HERMANN-

